Cylinder



(No Model.)

J. H. LEATHER.

GARDING GYLINDBR. No. 285,631. Patented Sept. 25, 1883.

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' NITEDE STATES PATENT Orinoco JOHN H. LEATHER, OF CLEGKHEATON, COUNTYOF YORK, ENGLAND.

CARDING-CYLINDER.

SPECIFICATION forming part of Letters Patent No. 285,631, datedSeptember 25, 1883,

Application filed May 17, 1883. (No model.) Patented in England August10, 1877, No. 3,057.

T0 at whom it may concern Be it known that I, JOHN HENRY LEATHER, asubject of the Queen of Great Britain and Ireland, and residing atOleckheaton, in the county of York, England, have invented cer taihImprovements in OardingCylinders, (for which I have obtained a patent inGreat Britain, dated the 10th day of August, 187 7, No. 3,057,) of whichthe following is a specification.

My invention consists of certain improvements in that class of cylindersfor carding or which, on account of its coarseness in pitch,

it has not hitherto been applicable.

I accomplish my improvement in the following manner: I cut one or morecontinuous spiral grooves or threads in the periphery of the cylinder,round which I wind the sawtoothed wire, inserting the flange or rib atthe back of the wire into the groove or thread, and pressing out theflange or rib bya process called milling or riveting, so as to make itquite fast in precisely the same manner as is now generally in use; but(and this is what constitutes my invention) the flange or rib of thiswire is so formed that instead of being entirely or almost entirelyburied in the groove, as has hitherto been the case, one-half of itsentire depth, which is double the depth of the groove into which it isinserted, stands above the natural surface or periphery of the cylinder,so forming another artificial spiral groove or thread, into which I nowproceed to wind a second series of toothed wire, in all respects exactlysimilar to the first series, eX- cept that the flange or rib is onlyjust one-half the depth of the flange or rib in the first series, sothat when this second toothed wire is placed in the artificial grooveand the flange cylinder A.

or rib is expanded and made quite fast therein by what is commonlycalled milling, riveting, or any other known process, the

tops of the flanges or ribs of the first and secteeth or wires that canbe obtained by the ordinary method now in use.

The difficulty, asj s well kn own, in constructing fine-pitchedcylinderssay above twelve to the inchis the liability of the metalbetween the grooves to break, and thus leave no support for the flangeor rib of the toothed wire, whereas by my improvement, if the metalbetween the grooves is partly broken, the introduction of the secondseries of toothed wire supports the coil of the first series of toothedwire in the groove, and when operated upon in the manner beforedescribed the whole is rendered quite secure 5 and, more over, as in myimprovement I only require a groove to be cut in the cylinder for everyalternate coil. of wire, it necessarily follows that in clothing acylinder having the same number of rows of wire by my invention I onlyrequire a groove or thread of one-half the number of cuts per inch, andtherefore the rib of metal left between such cuts will be of double thethickness, and consequently very much less likely to break, than in thecase with a cylinder cut and clothed upon the old system.

In the accompanying drawings, Figure 1 represents an enlargedlongitudinal section through one side of a cylinder into which the wireteeth are fixed upon my improved principle, and Fig. 2 is an enlargedside elevation of the saw-toothed wire.

The cylinder-shell is indicated by the letter A. The grooves or threads13 B are cut in the circumference of the cylinder, into which I placethe flange or rib of the toothed wire 0, which projects above thecircumference of the The toothed wire is secured in the groove by thecommon method of milling or riveting. The flange or rib of the toothedwire D is inserted between the projecting pon By these means I amlateral direction double the number of rows of tion of the flange or ribof coil O-that is, grooves, and intermediate toothed wire seabove thecircumference of the cylinder and cured betweentheflangesof thewirecontained the back or straight part E. The flange of in the grooves,substantially as set forth. coil D is milled or riveted, and thus madequite In testimony whereof I have signed my name 15 5 secure, and whenfinished the points. of the to thisspecification in the presence of twosubteeth of the two coils are all the same distance scribing witnesses.from the center of the cylinder.

What I claim as my invention is- JOHN HENRY LEATHER The combination of acarding or opening \Vitnesses:

1o cylinder having grooves in its circumference JOHN GILL,

with flanged toothed wire secured in said ARTHUR J. TAYLOR. J

